Shulou(Shulou.com)06/03 Report--

This article will explain in detail the points for attention on js subtype rewriting. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

1. Sometimes a candidate type needs to override a supertype method. If the method overridden by the subtype is written before the prototype is changed, the inherited supertype method overrides the method defined by the subtype and the override is invalid.

2. The rewriting method of subtype needs to be changed after the prototype is changed.

Example

/ / parent constructor function Father () {this.name = "father" this.house = "cottage"} / / prototype method Father.prototype.alertName = function () {console.log (this.name)} / / Child constructor function Children () {this.name = "children"} / / implement inheritance: prototype object of child constructor = instance object of parent constructor Children.prototype = new Father () / / after replacing the prototype The rewriting method Children.prototype.alertName = function () {console.log ('after replacing the prototype, the rewriting method is valid)} / / creating a subinstance let c = new Children () c.alertName () / / after replacing the prototype, the article on the effectiveness of the rewriting method on js subtype rewriting is shared here. I hope the above content can be helpful to you. So that you can learn more knowledge, if you think the article is good, please share it for more people to see.

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